Hi Gang, I responded to a thread, reference Winchester Model 270, before; but this is my first thread. I bought a Rem. 600 "Mohawk" in 1987 at a US Army Rod and Gun Club here in Germany. The seller was a German gunsmith, who had rechambered the gun from 222 to 223 in accordance with the wishes of the previous owner (who was then unable to pay the bill).The mod was done very well. Largely because of increasingly difficult restrictions on American personnel who owned firearms, I was not able to shoot the rifle much. Recently, the situation became virtually impossible and I sent the Remington and my Winchester back to the US. After over 20 years with the DOD in Germany I'm now preparing to return to the states (and active shooting). Can someone advise me regarding a 223 bullet going through a 222 barrel? Would the rifle have performed better before it was rechambered? Do I expect reduced accuracy, range, stability or some other undesirable result (compared to before)? Or should there be little or no performance difference? What, if any, differences are there in rifling, for example, between a 222 and a 223 barrel, that are likely to make a performance difference? Would it be worthwhile to consider re-barreling, using a new 223 barrel? A lot can be accomplished with creative reloading. If the negative performance factors are minor, could they be overcome by tailoring the reloaded cartridge to the gun? What do you think? I welcome your advice. Before someone asks, I'm sure the safety recall mod has not been performed on the gun, yet. Just a short addendum. I have no way to compare current performance with pre-223 cal. performance. But, if it can be improved, I want to improve it.